linux-kernel - Re: MSI broken in libata?

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Message-ID: <4B484829.6060405@kernel.org>
Date:	Sat, 09 Jan 2010 18:11:05 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Torsten Kaiser <just.for.lkml@...glemail.com>
CC:	linux-kernel@...r.kernel.org, Jeff Garzik <jgarzik@...ox.com>,
	linux-ide@...r.kernel.org
Subject: Re: MSI broken in libata?

On 12/25/2009 06:22 PM, Torsten Kaiser wrote:
> As reported in http://lkml.org/lkml/2009/12/19/82 the new MSI support
> for sata_sil24 does not work for me.
> This is still the same with 2.6.33-rc2.
> 
> Why I think, this might be a problem within libata:
>  * other drivers can use MSI successful on my system (tg3, radeon, hda-intel)
>  * happens both in sata_sil24 and sata_nv
>  * the count in /proc/interrupts increases for the MSIs assigned to
> sata_sil24/sata_nv, so interrupt delivery seems to work
>  * only writing seems to fail

How does it fail?  Timeouts?  Also, ahci enables MSI by default if
available and works fine on many configurations so I don't think
anything in libata core layer is broken regarding MSI (there just
isn't anything which can break).

Thanks.

-- 
tejun
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